Transient Analysis #

Transient analysis (.tran) shows how voltages change over time. It’s the go-to mode for oscillators, filters, pulse responses, and any time-varying behavior.

How to run it #

1. Select the Oscilloscope tool and tap tie points to place probes.
2. Open the oscilloscope and choose Transient Analysis.
3. Set the time window and run (tap Run Simulation or press Return).

The free version plots up to 2 probes; Premium plots unlimited signals.

Reading the plot #

• X-axis: time (seconds).
• Y-axis: voltage (V).
• Each probe is a separate, color-coded trace.

Example: RC charging #

Build a voltage source → resistor → capacitor (to ground), probe the capacitor, drive the source with a step or pulse, and run. You’ll see the exponential charge curve with time constant τ = RC.

Premium add-ons #

• CSV export of the plotted data.
• Temperature Sensitivity and Tolerance & Monte Carlo applied to the run (see those pages).

Tips #

• Start with a wider time window, then zoom into the region of interest.
• Use several probes to compare signals at different nodes.
• Compare results against your hand calculations to catch wiring mistakes.